1. Professor, Dept. of Civil and Environmental Engineering, Stanford Univ., Stanford, CA 94305-4020.
2. Graduate Student, Dept. of Civil and Environmental Engineering, Stanford Univ., Stanford, CA 94305-4020.
3. SE, Chief Structural Engineer, ABS Consulting, 1111 Broadway, 10th Floor, Oakland, CA 94607.
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois, Urbana, IL 61801.